Panasonic Viera TC-P46S2 Not Turning On

[gideon277]

Okay first let me say I have no LED at all solid, blinking, or otherwise. I have the back of the set off. I have inspected caps and none appear to be bad. All fuses check good. I have standby power about 6v give or take. Just when I push the power button nothing happens.

I am going to program a Universal remote and attempt to power on the set that way but I doubt its a bad power switch.

[tw2005]

Re: Panasonic Viera TC-P46S2 Not Turning On

I'm thinking possibly A board, but SC board can fail and short out the PSU.

Tom's usually a wizz on the A board diagnostics.





Only get 2 downloads a day there, hope it helps out.

[tw2005]

Re: Panasonic Viera TC-P46S2 Not Turning On

.

[gideon277]

Re: Panasonic Viera TC-P46S2 Not Turning On

Thank you very much huge help. I will use the diagram and keep you posted on the end result.

[gideon277]

Re: Panasonic Viera TC-P46S2 Not Turning On

okay I had a death in the family so had to take a break from the t.v. I am not at a place where I have isolated, according to the manual, the A board must be replaced. Wonder if I can delve further and see what on the A board is actually causing the problem. Could it be something as simple as a faulty switch?

oh and if I swap out the 'A' board which is part number TNPH0831 2A can I use TNPH0831 3A. The boards seem identical with the exception of the 3A has the vga port below the HDMI ports the 2A has deleted this option.

[tom66]

Re: Panasonic Viera TC-P46S2 Not Turning On

You may have difficulty with the additional VGA port because the case won't fit. Also, the panel size may need to be the same 42" might not work in 46" for example.

[tw2005]

Re: Panasonic Viera TC-P46S2 Not Turning On

sorry to hear of your grief, my condolences.

There's more to it than just VGA ports, like Tom says panel size, but wait there's more.

We have FHD & HD all using TNPH0831 PCBs. So which one, are you looking at ?

From your description I think you maybe looking at an A-board from a 50PX24?

I'm not seeing any VGA ports on the FHD model boards which yours is one of.

On top of this the SC and C1/C2 ribbons of a FHD are not the same as a HD.

If you look at the boards below I have 46C2 (HD), 46S2(FHD),

take note of connectors for HD A21, A33, A34 are used and are outermost.

FHD A20, A31, A32 and are inboard. They are also larger with more connections.

BADCAPS search TNPH0831

Post 9 revisions list, there is an error on rev AC, it's not a 50C2 model board, SJ has it wrong

Your only hope of using a different board I believe would be


Find a FHD A-board

Get a copy of the service manual for your model and of the model of the donor board

Compare the part numbers of all the Flash ICs and EEPROMs and any chip that's different form yours would need to be swapped over or replaced with a new one.
Only problem with this is you'll need a steady hand and good skills and eyes if the 56 pin Flash IC needs swapping, the rest are 8pin and if any of these are the cause of the original fault, the problem will be transferred across.

I've done this once converting a 50" New Zealand HD to a 42" Australian HD, worked except one of the eeproms was the original fault and transferred across.

Correct board for yours should be TNPH0831AB or TXN/A1LLUUS . There's a REV template on the board, REV is determined by the position of some jumpers above this table.

[tw2005]

Re: Panasonic Viera TC-P46S2 Not Turning On

These are the ICs I'm talking about

Ic8004 tvrr188aas ic 46s2, 8 pin $6.45

ic8502 tvrr166ags ic tcp42u2,tcp46s2,tcp50s2,tcp54s2 This is good, the 56pin is the same, that leaves just the easy ones to swap!

Note 58" is different

ic8503 tvrr168aas ic 46s2, 8 pin $10.04

ic9001 tvrr208abs ic 46s2, 8 pin $6.64

ic9304 tvrr216abs 46s2, 8 pin $8.64

None of the other ICs are unique to the 46S2 on that board.

[gideon277]

Re: Panasonic Viera TC-P46S2 Not Turning On

Okay so I purchased a new rev of the same part of the board that is necessary. The only problem is that the ribbon connectors on new board are of a smaller size. I cannot see doing the level of fine soldering that would be necessary to place the larger ribbon connectors on new board. Wondering if a newer set of ribbons would fix the problem but would they be the right size on the other end is a big question. Thank you for your help.

[tom66]

Re: Panasonic Viera TC-P46S2 Not Turning On

Might be a different revision - ask if seller could exchange for one with different ribbons, if not, you would have to send board back. It is rare to get ribbon cables with non matching ends.
If it has the smaller ones, could be 720p vs 1080p board so wouldn't work in your TV anyway unfortunately.

[gideon277]

Re: Panasonic Viera TC-P46S2 Not Turning On

Drats. I looked at it and honestly the only way to make it work is to replace the three other boards the ribbon goes to. By then its basically a whole new t.v and too much of an investment. I think I will part out the rest of this t.v and return board I purchased and just move onto the next t.v

[tw2005]

Re: Panasonic Viera TC-P46S2 Not Turning On

Drats. I looked at it and honestly the only way to make it work is to replace the three other boards the ribbon goes to. By then its basically a whole new t.v and too much of an investment. I think I will part out the rest of this t.v and return board I purchased and just move onto the next t.v

In post #7 I said find a FHD(Full high Definition) board. The pictures of the 2 boards are not the same.

If you look closely at the ribbon connectors, one board has smaller ones and are at the outermost edge. That will be HD model.

The other has them on the next set of pads inward and are larger which are the Full HD models.

I tried to highlight that fact because I made the same mistake not paying close attention to that detail myself.

You wont be able to do anything with the wrong board, don't attempt modifying those if you have the wrong board.

[asand211]

Re: Panasonic Viera TC-P46S2 Not Turning On

I've got a TC-P42S2. The three HDMI inputs no longer work. Other inputs work as they should. Is the board fried that contains the inputs?

[mmartell]

Re: Panasonic Viera TC-P46S2 Not Turning On

Yes, could be the HDMI controller chip on the main board.

[asand211]

Re: Panasonic Viera TC-P46S2 Not Turning On

So replacement of the entire board is the way to go? They are tough to find.

[mmartell]

Re: Panasonic Viera TC-P46S2 Not Turning On

It's the way to go unless you can troubleshoot and replace smd components on that board. Are there any voltage regulators on it ? You can test those to make sure they're not causing problems.

[asand211]

Re: Panasonic Viera TC-P46S2 Not Turning On

That might be above my head unless you could provide some direction. I've replaced capacitors before but that's about it.

[mmartell]

Re: Panasonic Viera TC-P46S2 Not Turning On

Do a search here for testing voltage regukators - it's not hard but you will need a DMM.

[mattaw]

Re: Panasonic Viera TC-P46S2 Not Turning On

Morning! I lack the power to create a new thread, but will do so as soon as I can.

I have a lovely Panasonic TC-P46S2 TV, with relays clicking on, green leds on SD & SC, but then clicks off with only one blink indicating SOS/PD4 problems. Tried unplugging ribbons etc, and tracing power supplies on the A board but all seems fine. No bad caps anywhere, sadly!

It seems replacement TNPH0831AB A board has not been in stock anywhere for over two years! I can get one for the TC-P50S2 fairly easily, however the EEPROM chips will need transferring over.

I saw in Austech forums and here that you converted an NZ Panasonic to AU, and I wanted to know:

1. Can I install the P50S2 A board in the TV for testing without hurting anything?
2. Should I transfer the flash chips one at a time across until it works?
3. Any advice?

Thanks!

Matthew

These are the ICs I'm talking about

Ic8004 tvrr188aas ic 46s2, 8 pin $6.45

ic8502 tvrr166ags ic tcp42u2,tcp46s2,tcp50s2,tcp54s2 This is good, the 56pin is the same, that leaves just the easy ones to swap!

Note 58" is different

ic8503 tvrr168aas ic 46s2, 8 pin $10.04

ic9001 tvrr208abs ic 46s2, 8 pin $6.64

ic9304 tvrr216abs 46s2, 8 pin $8.64

None of the other ICs are unique to the 46S2 on that board.